黑龙江省大兴安岭富西里地区金多金属矿床综合信息成矿预测

发布时间：2018-04-01 18:46

  本文选题：综合信息　切入点：成矿预测　出处：《吉林大学》2015年硕士论文

【摘要】：富西里地区位于黑龙江省北部，地处兴安—蒙古造山带北缘与额尔古纳地块结合部位，属于额尔古纳—兴安成矿带之瓦拉里—北西里Fe-Au成矿亚带。区内地质工作程度较低，地质调查及矿产勘查工作多局限于目标矿区及外围，为了进一步查明区内的矿产资源，扩大找矿远景，本文对该区地质、物探、化探、遥感及矿产1:5万综合信息进行系统地分析和研究，提取了区域已有的地质、物探、化探和遥感标志信息，优选出有利的成矿远景区，为以后的找矿工作指明方向。 区内出露地层主要为新元古代兴华渡口岩群（Pt3xh），奥陶系库纳森河组（O1k）、黄斑脊山组（O1h）、大伊希康河组（O1-2dy），上侏罗统玛尼吐组（J3mn），下白垩统光华组（K1gn）和第四系松散沉积物。区域上与金成矿密切相关的岩浆活动主要为加里东期和海西期，通过野外观察和研究，海西期碱长花岗岩体与新元古界兴华渡口群接触部位矿化现象较明显，是金矿的产出有利部位，其中兴华渡口群是区内最主要的金矿源层。 通过对区内加里东期和海西期岩浆岩的岩石学和地球化学特征的综合分析，认为加里东期花岗岩源区主要为壳源，属于过铝质高钾钙碱性岩石系列；海西期花岗岩具高K特征，属于过铝质钾玄岩或高钾钙碱性岩系，这也有可能受到了一定的后期蚀变的影响。主微量元素特征显示两者均具岛弧岩浆特征。 区内的构造较发育，以断裂和脆韧性剪切带为主，NE向、NW向断裂交汇处以及NE向断裂构造向近EW向转折是研究区内金矿化主要产出部位。 区内航磁异常特征研究显示，，航磁异常分为4个异常场区，并划分出12个航磁异常，同时认为在正负异常伴生区域，其航磁异常梯度大，异常正负交替部位可能受到了断裂或蚀变带的影响，更加有利于成矿。 通过对区内1:5万水系沉积物数据处理和分析，认为本区找矿的主攻矿种是Au、Ag和Mo；其次是Cu、Pb、W和Bi等。在对成矿元素异常分析基础上，圈定出285处单元素异常和44处组合元素异常。元素异常主要分布于环形构造边部及外围，呈现出北东成串、北西成带，交汇复合部位成片的分布规律。 结合富西里地区地质、物探、化探、遥感及矿产综合信息，本文共圈定出8个成矿远景区，其中3个Ⅰ级（A类）成矿远景区，3个Ⅱ级（B类）成矿远景区及2个Ⅲ级（C类）成矿远景区。结合远景区找矿潜力的评价，最终优选出A类2个预测区（瓦拉里和库纳森山西侧预测区）为找矿靶区。
[Abstract]:The Fuxi area is located in the northern part of Heilongjiang Province and is located in the northern margin of the Xingan-Mongolia orogenic belt and the Erguna block. It belongs to the Fe-Au metallogenic subzone of the Erguna-Xingan metallogenic belt.The degree of geological work in this area is relatively low, and the geological survey and mineral exploration work are mostly confined to the target mining area and its periphery. In order to further find out the mineral resources in the area and expand the prospecting prospect, this paper deals with the geology, geophysical exploration and geochemical exploration in this area.The comprehensive information of remote sensing and mineral resources of 1: 50 000 has been systematically analyzed and studied, and the existing information of geology, geophysical exploration, geochemical exploration and remote sensing has been extracted, and favorable metallogenic scenic spots have been selected in order to point out the direction of prospecting in the future.The magmatic activities closely related to gold mineralization in the region are mainly Caledonian and Hercynian. Through field observation and study, the mineralization of the contact site between the Hercynian alkali feldspar granites and the Neoproterozoic Xinghua Dukou Group is obvious.Xinghua Dukou Group is the main source of gold deposits in the area.Based on a comprehensive analysis of the petrological and geochemical characteristics of Caledonian and Hercynian magmatic rocks in the region, it is concluded that the Caledonian granite source region is mainly crust-derived and belongs to the peraluminous high-potassium calc-alkaline rock series, and the Hercynian granitoids are characterized by high K content.It belongs to peraluminous kaliumite or high-potassium calc-alkaline rock series, which may also be affected by late alteration.The characteristics of main trace elements show that both of them have the characteristics of island arc magma.The faults and brittle ductile shear zones are the main areas of gold mineralization in the study area. The intersections of NE trending NW faults and NE trending faults near EW direction are the main occurrence sites of gold mineralization in the study area.The study on the characteristics of aeromagnetic anomalies in the region shows that the aeromagnetic anomalies are divided into 4 anomalous fields and 12 aeromagnetic anomalies, and it is considered that the gradient of aeromagnetic anomalies is large in the associated areas of positive and negative anomalies.The abnormal positive and negative alternates may be affected by faults or altered zones, which is more favorable for mineralization.Based on the data processing and analysis of the sediment of 1: 50 000 drainage system in this area, it is concluded that the main ore-prospecting species in this area are Au-Ag and Mo-, followed by Cu-PbPb-W and Bi, etc.Based on the analysis of metallogenic element anomalies 285 single element anomalies and 44 combined element anomalies are delineated.The element anomalies are mainly distributed in the edge and periphery of the annular structure, showing the distribution law of the north east string, the north west belt and the intersection compound part.Combined with the comprehensive information of geology, geophysical exploration, geochemical exploration, remote sensing and mineral resources in Fuxili area, 8 metallogenic scenic spots have been delineated in this paper.Among them, 3 grade 鈪

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